If you have a Scott catalog( and you should if you collect older US ) you can see that a green cancel is indeed very much rarer than others. As a matter of fact, both green and red are very good ones.
As far as green cancels go, the two most commonly seen are Tallahassee, FL and Princeton, NJ (Not that either are common) but other locations exist, I recall seeing them from at least 3 other locations; Towns in Delaware and New Hampshire and Lockport, NY come to mind.
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